Answer:
The rate will get slower.
Step-by-step explanation:
Plants need light, carbon dioxide, and water for photosynthesis. If you limited two of those, then it would be harder for the plant to make photosynthesis.
Its kind of like for humans. If you limit the amount of oxygen then its harder to breathe, so it makes it stuffy. If you don't get sunlight, then you won't get vitamin D, your bone health will be weak, you would get a lot of blood pressure, diseases, and taking away a lot of your good mental health.